Line burst

[verdell]

The 3 inch rubber submersible line connecting the EP381 pump to the sending unit supply tube ruptured twice. 2015 5.3, 1987 fuel tank and sending unit, corvette filter/regulator. New 5/16 return line, new braided stainless 6 AN supply line. All lines are secure, unobstructed and connected to correct location on sending unit. New fuel pump, new ‘87 tank, filter regulator replaced about 5 months and 500 miles ago. The truck runs fine for a few days and blows this line for some reason. This is a friends ‘85 squarebody. Any thoughts? Bad filter/regulator?

[Rickysnickers]

Don't want to assume anything, but it fuel injection rated hose?

[verdell]

Originally Posted by Rickysnickers

Don't want to assume anything, but it fuel injection rated hose?

Yes. Its the submersible fuel injection rated hose that comes with the EP381 pump.

[Rickysnickers]

Well, I'm no help on the other items you are asking about. However, I still honestly suspect that the piece of fuel line might be the issue. Napa, if there is one close by, sells fuel injection rated, submersible fuel line. I would try with a section of that. https://www.napaonline.com/en/p/NBHH213

[verdell]

Originally Posted by Rickysnickers

Well, I'm no help on the other items you are asking about. However, I still honestly suspect that the piece of fuel line might be the issue. Napa, if there is one close by, sells fuel injection rated, submersible fuel line. I would try with a section of that. https://www.napaonline.com/en/p/NBHH213

I appreciate the insight but the line has been replaced with injection grade submersible hose ($39.99/ft). It runs for a while and ruptures again. I was thinking a bad regulator and was hoping someone has dealt with a similar issue. I've ran the same set up on at least 5 pickups including my own with no issues. I'm really hoping running new lines from the rail to the filter/regulator along with a better quality filter/regulator fixes it. Thanks again though.

[LS short box]

I've used the rubber type hose like you have on LS swaps but on my last couple of LS swaps I used Tank's Inc tanks and they supply fuel line that is more like a hard plastic. You might check with Tanks to see if they will sell you the hard plastic hose.

[LS short box]

Over on LS1tech they always say use a C5 FFR from AC Delco or Wix from NAPA. The down side is both are getting to be expensive. They used to be $50-$60. Now close to $100.